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Phillipsite-Na crystals - click for larger pic
Phillipsite-Na crystal
Photo by Violet Anderson
László Horváth specimen
© Royal Ontario Museum

Phillipsite-Na crystals - click for larger pic
Phillipsite-Na crystals
© Doug Merson

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Home > Mineral Descriptions > Phillipsite-Na - (3 Photos)



Phillipsite-Na
(Na,K,Ca)1-2(Si,Al)8)O16 · 6H2O

     Phillipsite is widespread in small quantities at Mont Saint-Hilaire and
is indistinguishable visually from harmotome.

PHYSICAL CHARACTERISTICS:

Color is usually colorless or white.
Luster is vitreous.
Diaphaneity is transparent to translucent.
Crystal System is monoclinic; P21/m.
Crystal Habits include very small clusters of cruciform twins and
   prismatic crystals.
Cleavage {010} and {100} are distinct.
Fracture is uneven to subconchoidal.
Hardness is 4 - 4.5
Specific Gravity is approximately 2.2 g/cm3.
Streak is white.
Associated Minerals include aegirine, albite, amphibole group,
   analcime, ancylite, calcite group, catapleiite, cordylite, elpidite,
   eudialyte, fluorapatite, galena, microcline, monteregianite,
   natrolite, pyrophanite and titanite.
Distinguishing Features: Crystal habit and twinning habit.
Origin: Named in 1825 after William Phillips (1775-1828), British
   mineralogist and geologist.

CLASSIFICATION:

Dana System
# 77.1.3a.1

Strunz Classification
# VIII/J.25-50

REFERENCES:
MinRec 21:330 (1990), Dana 8:1665-1666 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
¤¤¤

PE
¤¤

AP
--

MX
--

SS
--

MC
¤¤

HF
--

BR
--

SX
¤¤

FR
--

Legend

Phillipsite-Na crystals - click for larger pic
Phillipsite-Na crystals
Photo by Violet Anderson
© Royal Ontario Museum